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A reinvestigation of the reaction of the dihydrothiophenes (1a, b) with thionyl chloride confirmed that the sulphines (2) are the products obtained, the structure of (2a) being ascertained by X-ray diffraction analysis of its Diels-Alder adduct (3a): the same reaction on dihydrothiophene (6) produced the corresponding sulphine (7).
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Reference：
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem